Increased on‐column injection temperature for gas chromatography

Abstract

AbstractA way of controlling the maximum allowable oven temperature during on‐column injection by the column pressure drop is suggested. An arrangement using a restriction at the column outlet for adjustment of the column inlet pressure while maintaining the same column flow has been studied. Compared to non‐restricted flow, substantially increased maximum oven temperatures were obtained during on‐column injection. Injections at elevated temperatures resulted in an increased speed of analysis and decreased solute adsorption on the surface of the contaminated retention gap. The method is generally applicable to analysis of high boiling mixtures. In particular, with GC‐AED, such an arrangement yields a higher sensitivity due to an increased solute interaction with the excitation plasma.